package cn.tedu;

import java.sql.*;
import java.util.Scanner;

public class Demo12 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入用户名");
        String username = scan.nextLine();
        System.out.println("请输入密码");
        String password = scan.nextLine();
        System.out.println("请输入昵称");
        String nickname = scan.nextLine();
        try (
                Connection conn = DBUtils.getConn();
                ){
            String sql = "select id from user where username=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                System.out.println("用户名已经存在");
                return;
            }
            String insertSql = "insert into user values(null,?,?,?)";
               PreparedStatement insertPs = conn.prepareStatement(insertSql);
            insertPs.setString(1,username);
            insertPs.setString(2,password);
            insertPs.setString(3,nickname);
            insertPs.executeUpdate();
                System.out.println("注册成功");


        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}
